2K-superconducting state with less disorder in the organic superconductor ß-(BEDT-TTF)2I3

S. Kagoshima, M. Hasumi, Y. Nogami, N. Kinoshita, H. Anzai, M. Tokumoto, G. Saito

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


Annealing of the title compound at about 110 K for 20-40 hr causes a change in the superstructure, and gives rise to two superconducting states with the critical temperatues of 2 K and ∼7.5 K. The former state is found to occupy most of the sample volume. This state having Tc ∼ 2K, found in the present study for the first time,has a lower resistance and a narrower EPR linewidth in its normal state than this compound without annealing has. A conjecture is given that the state with Tc ∼ 2 K has only the A-type conformation of BEDT-TTFmolecules leading to the reduction of disorder related to the conformational degree of freedom and to the resultant increase of Tc from 1-1.5 K of the so-called "low-Tc" state of this material. The other state with Tc ∼ 7.5K is interpreted to be nothing but the "high-Tc" state having no superstructure.

Original languageEnglish
Pages (from-to)843-846
Number of pages4
JournalSolid State Communications
Issue number10
Publication statusPublished - Sept 1989
Externally publishedYes

ASJC Scopus subject areas

  • General Chemistry
  • Condensed Matter Physics
  • Materials Chemistry


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